India, May 30 -- LUCKNOW The UP Anti-Terrorist Squad (ATS) is scanning credentials of around 800 people added to 19 "anti-national" WhatsApp groups operated by Tufail Maqsood, 34, who was arrested by the agency from Varanasi on May 21 on charges of spying for Pakistan, said officials on Friday.

The details have been retrieved from Tufail's phone and credentials of people linked to his social media network are being cross-checked, said officials interrogating the accused.

Tufail Maqsood, Delhi resident Mohd Harun, 45, who was arrested from Noida by UP ATS on May 21 and Rampur resident Shahzad Wahab, 35, who was nabbed in the same connection from Moradabad on May 18, are in ATS custody for interrogation.

An ATS official said Tufail creat...